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Academy of Country Music
United Press International's nominee story of March 4, 1991 says the awards were 'to be presented April 24 in Los Angeles'; a Backstage Country[5] 'This Day in Country History' item (April 24) puts the 26th show at the Universal Amphitheatre on April 24, 1991, and Wikipedia[2] agrees.
Garth Brooks won six of his seven categories at the 26th Academy of Country Music Awards on 24 April 1991 at the Universal Amphitheatre, including Entertainer of the Year, Album of the Year for No Fences and Single Record of the Year for "Friends in Low Places".